<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div id="add">
    v-text:<span v-text="message"></span><br>
    v-html:<span v-html="message"></span><br>
</div>
</body>
<script src="node_modules/vue/dist/vue.js"></script>
<script>
    var add = new Vue({
        el: "#add",
        data:{
            message:'<h1>hello</h1>'
        }
    })
</script>
</html>